Processing method of rectifying tower condensate of wastewater containing dimethyl formamide

A technology of dimethylformamide and treatment method, which is applied in the field of condensate treatment of dimethylformamide wastewater rectification tower, can solve the problems of secondary pollution of dimethylamine and high cost of wastewater, and achieve no secondary pollution, The effect of low cost and convenient operation

Active Publication Date: 2013-12-25
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a kind of condensed water in a rectification tower of dimethylformamide waste water, w

Method used

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  • Processing method of rectifying tower condensate of wastewater containing dimethyl formamide
  • Processing method of rectifying tower condensate of wastewater containing dimethyl formamide
  • Processing method of rectifying tower condensate of wastewater containing dimethyl formamide

Examples

Experimental program
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Embodiment 1

[0028] Select reverse osmosis membranes on the market and ultrafiltration membranes made of PP materials, with a pore size of 0.03 μm, and connect several reverse osmosis membranes to form a three-stage treatment device.

[0029]With the treatment method of the condensed water of the rectifying tower containing dimethylformamide wastewater, it is determined that the CODcr in the condensed water of the rectifying tower of the dimethylformamide wastewater is 3000 mg / L, and the ammonia nitrogen is 100 mg / L. First, the pH value is measured to obtain a pH of 10, adjusted to a pH of 5 by acid, and then filtered through the filter membrane with a pore size of 0.03 μm to obtain the clear liquid, wherein the ultra-microfiltration membrane is a hollow fiber membrane; the filtered clear liquid The liquid enters the first-stage reverse osmosis membrane device for concentration. The operating conditions of the first-stage reverse osmosis membrane device during the concentration process are ...

Embodiment 2

[0031] Select reverse osmosis membranes on the market and ultrafiltration membranes made of PVDF materials, with a pore size of 0.06 μm, and connect several reverse osmosis membranes into a three-stage treatment device.

[0032] With the treatment method of the condensed water of the rectifying tower containing the dimethylformamide waste water, after measuring, the CODcr in the condensed water of the rectifying tower of the dimethylformamide waste water is 4000mg / L, and the ammonia nitrogen is 150mg / L. Firstly, the pH is determined to be 9.5 by the pH value, and then adjusted to pH 6 with a small amount of acid, and then filtered through the filter membrane with a pore size of 0.06 μm to obtain the clear liquid, wherein the ultra-microfiltration membrane is a hollow fiber membrane; the filtered clear liquid The liquid enters the first-stage reverse osmosis membrane device for concentration. The operating conditions of the first-stage reverse osmosis membrane device during the ...

Embodiment 3

[0034] Select reverse osmosis membranes on the market and ultrafiltration membranes made of PVC materials, with a pore size of 0.06 μm, and connect several reverse osmosis membranes to form a three-stage treatment device. Pressure 8.0Mpa, under normal temperature conditions.

[0035] With the treatment method of the condensed water of the rectifying tower containing dimethylformamide waste water, the CODcr in the condensed water of the rectifying tower of the dimethylformamide waste water is 4800 mg / L and the ammonia nitrogen is 250 mg / L. First adjust the pH value, adjust the pH to 7 with 8% hydrochloric acid with a mass concentration, and then filter through the above-mentioned filter membrane with a pore size of 0.1 μm to obtain the clear liquid, wherein the ultra-microfiltration membrane is a hollow fiber membrane; the filtered clear liquid The liquid enters the first-stage reverse osmosis membrane device for concentration. The operating conditions of the first-stage revers...

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Abstract

The invention discloses a processing method of rectifying tower condensate of wastewater containing dimethyl formamide, and in particular relates to generation of dimethyl formamide containing wastewater containing dimethyl formamide in a poly urethane (PU) synthetic leather production process. The processing method comprises the steps of regulating pH value of tower condensate, and filtering to obtain clear liquid; condensing the clear liquid in a primary reverse osmosis membrane device to obtain primary weak liquid and primary thick liquid; condensing the primary thick liquid in a secondary reverse osmosis membrane device once again to obtain secondary weak liquid and secondary thick liquid, and circulating the secondary weak liquid in an original water tank, while discharging or recycling the secondary thick liquid; meanwhile, processing the primary weak liquid in a tertiary reverse osmosis membrane device to obtain tertiary weak liquid and tertiary thick liquid, and circulating the tertiary thick liquid in the original water tank, while discharging or recycling the tertiary weak liquid. In the processing process, the method has the advantages of low cost, no secondary pollution and the like, and is convenient to operate and good in effect.

Description

technical field [0001] This aspect relates to a treatment method for condensed water in a rectification tower of dimethylformamide wastewater, especially to a kind of wastewater containing dimethylformamide produced in the production process of PU synthetic leather. The rectification tower produced in the rectification process Condensate at the top of the tower. Background technique [0002] Dimethylamine, English name Dimethylamine, abbreviated as DMA. In the production process of synthetic leather, N,N-dimethylformamide (DMF) is widely used as a solvent in the surface treatment process of synthetic leather, and the mass percent concentration of N,N-dimethylformamide (DMF) produced is 15 % of waste water. Synthetic leather enterprises use rectification method to recover solvent DMF. Generally, three rectification towers are used. The waste water is steamed from the top of the tower, and the tower condensate is produced after condensation, which often contains trace amount...

Claims

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Application Information

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IPC IPC(8): C02F9/04C07C233/03C07C231/24C02F1/44
CPCY02A20/131
Inventor 邱晖谢柏明丁国良赵经纬张锋方元余鸿
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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